2108 PRELIMS

Question 1

Why do we have to do maintenance?

Answer 1

“The maintenance of an aircraft provides assurance of
flight safety, reliability, and airworthiness.”

Question 2

Why Aircraft Maintenance is Important

Answer 2

• Avoiding lost flights because of failure.
• Maintaining good performance.
• Ensuring passenger safety.
  -Extending the life of the aircraft.

Question 3

If you want to make sure that everything is in its perfect condition, schedule regular aircraft maintenance
and replacement of damaged parts in accordance with aircraft performance manuals from the relevant
manufacturers.

Answer 3

Avoiding lost flights because of failure.

Question 4

Regular maintenance will ensure that the aircraft is serviceable for the time it flies. Operational checks
before every flight will make sure that failure does not occur before any trip.

Answer 4

Maintaining good performance.

Question 5

Passenger safety is the priority of any airline, and through regular maintenance and checks, we will assure
that the travel of those passengers will be undertaken in the safest and smoothest way possible.

Answer 5

Ensuring passenger safety.

Question 6

However, all types of aircraft will have one standard maintenance procedure, which you should
carry out WHEN

Answer 6

before every flight

Question 7

Regular maintenance will extend aircraft life and ensure that aircraft will perform safely for the expected
period of time.

Answer 7

Extending the life of the aircraft.

Question 8

The role of an aircraft engineer

Answer 8

involves the application of scientific and technological principles to the research, development and design of aircraft and their components.

Question 9

The Role of the Mechanic

Answer 9

Aircraft mechanics perform inspections, make repairs and perform scheduled maintenance of aircraft. They
have the ability to diagnose both electrical and mechanical problems and identify repair procedures.

Question 10

Two types of Maintenance

Answer 10

Preventive maintenance and Corrective maintenance

Question 11

usually performed at regular intervals. This is done to prevent deterioration of the system to an unusable level and to keep it in operational condition.

Answer 11

preventive maintenance

Question 12

It is sometimes referred as scheduled maintenance.

Answer 12

preventive maintenance

Question 13

every when is preventive maintenance held

Answer 13

This could be daily, every flight, every 200 flight hours, or every 100 cycles (a cycle is a takeoff and a landing.)

Question 14

Since these breakdowns occur at various, unpredictable intervals, the maintenance actions employed to correct the problem are referred to as

Answer 14

corrective maintenance

Question 15

corrective maintenance is also called

Answer 15

unscheduled maintenance

Question 16

goals of an airline maintenance program

Answer 16

• To deliver airworthy vehicles to the flight department in time to meet the flight schedule
• To deliver these vehicles with all necessary maintenance actions completed or properly deferred

Question 17

The objectives of an airline in-service maintenance program are as follows:

Answer 17

1) To ensure the realization of the inherent safety and reliability levels of the equipment

2) To restore safety and reliability to their inherent levels when deterioration has occurred

3) To obtain the information necessary for adjustment and optimization of the maintenance program when these inherent levels are not met

4) To obtain the information necessary for design improvement of those items whose inherent reliability proves inadequate

5) To accomplish these objectives at a minimum total cost, including the costs of maintenance and the cost of residual failures

Question 18

The maintenance programs currently in use in commercial aviation were developed by the industry using
two basic approaches:

Answer 18

process oriented approach and the task oriented approach.

Question 19

difference between process oriented approach and task oriented approach

Answer 19

(a) the attitude toward maintenance actions and

(b) the manner in which maintenance actions are determined and assigned to components and systems.

Question 20

process-oriented approach

Answer 20

 Hard time(HT)
 On- condition (OC)
 Condition monitoring (CM)

Question 21

are for components Or systems that have definite life Limits or detectable wear out periods.

Answer 21

hard time and on-condition

Question 22

are operated to failure and failure rates are tracked to aid future prediction or failure rate prevention.

Answer 22

condition monitoring

Question 23

task-oriented approach

Answer 23

 Uses pre determined tasks to avoid in- service failures
 Rebundancy and reliability programs utilized.

Question 24

is a failure preventive process which requires that the item be removed from the vehicle and either completely overhauled, partially overhauled (restored), or discarded before exceeding the specified interval.

Answer 24

Hard time

Question 25

The hard time interval may be specified by

Answer 25

calendar time, by engine or airplane check interval (engine change, “C” check, etc.), by landing or operating cycles, by flight hours, by block hours, by specified flights (over water, terminating, etc.), or in conjunction with another
process

Question 26

must be restricted to components, equipment, or systems on which a determination of continued airworthiness may be made by measurements, tests, or other means without doing a tear-down inspection. These on condition checks are to be performed within the time limits (intervals) prescribed for each OC check.

Answer 26

on-condition

Question 27

involves the monitoring of the failure rates, removals, etc. of individual components or systems that do not have a definite lifetime or a noticeable wear-out period.

Answer 27

condition monitoring process

Question 28

are operated until failure occurs and replacement of
CM items is an unscheduled maintenance action.

Answer 28

CM components

Question 29

MSG-1 was first published in

Answer 29

1968

Question 30

MSG-1 was used for developing scheduled maintenance for

Answer 30

B747

Question 31

process orientated and used a bottom-up approach. It also introduced ‘condition monitored maintenance’ concept.

Answer 31

MSG-2

Question 32

the original version of MSG-3 was first published in

Answer 32

1980

Question 33

MSG-3 introduced

Answer 33

top-down approach by focusing on ‘consequences of failure’.

Question 34

MSG-3 expected the assessment of functional failures and the assignment of the consequences of those failures into two basic categories,

Answer 34

Safety and Economic

Question 35

is a document developed by the Airlines For America (A4A) (formerly ATA).

Answer 35

MSG-3 (Maintenance Steering Group) ‘Operator/Manufacturer Scheduled Maintenance Development’

Question 36

‘Operator/Manufacturer Scheduled Maintenance Development’ aims to present

Answer 36

methodology to be used for developing scheduled maintenance tasks and intervals, which will be acceptable to the regulatory authorities, the operators and the manufacturers.

Question 37

The main idea behind ‘Operator/Manufacturer Scheduled Maintenance Development’ concept

Answer 37

recognise the inherent reliability of aircraft systems and components, avoid unnecessary maintenance tasks and achieve increased efficiency.

Question 38

underlying principles of MSG-3

Answer 38

 Maintenance only effective if task applicable
 No improvement in reliability by excessive maintenance
 Needless tasks can also introduce human error
 Few complex items exhibit wear out
 Monitoring generally more effective than hard-time overhaul - Condition-based maintenance
(sometimes known as CBM)
 Reliability only improved by modification
 Maintenance may not be needed if failure cheaper

Question 39

The basic goal of MSG-3

Answer 39

identify maintenance tasks which are both effective and efficient in enabling a new aircraft to be designed and operated in a manner which achieves a satisfactory level of safety and reliability throughout its life.

Question 40

process of MSG-3

Answer 40

(1)Systems and Powerplant (including components and APUs)
(2) Aircraft Structures
(3) Zonal Inspections
(4) Lightning/High Intensity Radio Frequency (L/HIRF).

Question 41

MSG-3 is widely used to develop initial maintenance requirements for modern commercial aircraft which are published as a

Answer 41

Maintenance Review Board Report (MRBR).

Question 42

FOUR SECTIONS OF MSG3

Answer 42

(1) Systems and Powerplant (including components and APUs)
(2) Aircraft Structures
(3) Zonal Inspections
(4) Lightning/High Intensity Radio Frequency (L/HIRF).